package middleNode;

import removeElements.Solution;

public class Soluttion {
    public class ListNode {
        int val;
        ListNode next;
        ListNode() {}
        ListNode(int val) { this.val = val; }
        ListNode(int val, ListNode next) { this.val = val; this.next = next; }
    }
    public ListNode middleNode(ListNode head) {
        // 快慢指针
        ListNode slow = head;
        ListNode fast = head;
        while (fast!=null&&fast.next!=null) {
            fast = fast.next.next;
            slow = slow.next;
        }
        return slow;
    }
}
